From 4fe7ef3a0811c33137ace0ed424dd0c01dd2d75e Mon Sep 17 00:00:00 2001 From: Rob Herring Date: Fri, 10 Feb 2012 17:05:13 -0600 Subject: [PATCH] ARM: provide runtime hook for ioremap/iounmap We have compile time over-ride of ioremap and iounmap, but an run-time override is needed for multi-platform builds. This adds an extra function pointer check, but ioremap is not peformance critical. The option for compile time selection remains. The caller variant is used here to provide correct caller information as ARM can only support level 0 for __builtin_return_address. Signed-off-by: Rob Herring Cc: Russell King Reviewed-by: Arnd Bergmann Reviewed-by: Nicolas Pitre --- arch/arm/include/asm/io.h | 7 ++++++- arch/arm/mm/ioremap.c | 17 ++++++++++++++--- 2 files changed, 20 insertions(+), 4 deletions(-) diff --git a/arch/arm/include/asm/io.h b/arch/arm/include/asm/io.h index 9275828feb3d..6c363c16851c 100644 --- a/arch/arm/include/asm/io.h +++ b/arch/arm/include/asm/io.h @@ -83,6 +83,11 @@ extern void __iomem *__arm_ioremap_pfn(unsigned long, unsigned long, size_t, uns extern void __iomem *__arm_ioremap(unsigned long, size_t, unsigned int); extern void __iomem *__arm_ioremap_exec(unsigned long, size_t, bool cached); extern void __iounmap(volatile void __iomem *addr); +extern void __arm_iounmap(volatile void __iomem *addr); + +extern void __iomem * (*arch_ioremap_caller)(unsigned long, size_t, + unsigned int, void *); +extern void (*arch_iounmap)(volatile void __iomem *); /* * Bad read/write accesses... @@ -266,7 +271,7 @@ extern void _memset_io(volatile void __iomem *, int, size_t); */ #ifndef __arch_ioremap #define __arch_ioremap __arm_ioremap -#define __arch_iounmap __iounmap +#define __arch_iounmap __arm_iounmap #endif #define ioremap(cookie,size) __arch_ioremap((cookie), (size), MT_DEVICE) diff --git a/arch/arm/mm/ioremap.c b/arch/arm/mm/ioremap.c index 80632e8d7538..024629046f1f 100644 --- a/arch/arm/mm/ioremap.c +++ b/arch/arm/mm/ioremap.c @@ -306,11 +306,15 @@ __arm_ioremap_pfn(unsigned long pfn, unsigned long offset, size_t size, } EXPORT_SYMBOL(__arm_ioremap_pfn); +void __iomem * (*arch_ioremap_caller)(unsigned long, size_t, + unsigned int, void *) = + __arm_ioremap_caller; + void __iomem * __arm_ioremap(unsigned long phys_addr, size_t size, unsigned int mtype) { - return __arm_ioremap_caller(phys_addr, size, mtype, - __builtin_return_address(0)); + return arch_ioremap_caller(phys_addr, size, mtype, + __builtin_return_address(0)); } EXPORT_SYMBOL(__arm_ioremap); @@ -369,4 +373,11 @@ void __iounmap(volatile void __iomem *io_addr) vunmap(addr); } -EXPORT_SYMBOL(__iounmap); + +void (*arch_iounmap)(volatile void __iomem *) = __iounmap; + +void __arm_iounmap(volatile void __iomem *io_addr) +{ + arch_iounmap(io_addr); +} +EXPORT_SYMBOL(__arm_iounmap); -- 2.20.1